Philip Seymour Hoffman: How could drugs kill someone so smart?

I am a movie fan, and I really admired Philip Seymour Hoffman. I’ve watched his Capote more than once, and have enjoyed him in other movies. When I heard he died from a drug overdose I was shocked. I’d seen this man on the PBS show Charlie Rose, and he’d always impressed me as an extraordinarily thoughtful and intelligent person. He really delved into his characters. 

I really shouldn’t have been that surprised. For a brief time, I worked at a drug and alcohol facility and talked to a lot of addicts. I have to say some of them had sad stories about growing up, but some of them weren’t like that at all. Some of them were people you would never imagine would become addicted to substances.

I think being human makes us all vulnerable to wanting to feel better. 
It’s just so sad. What a waste of humanity.
Rest in peace Mr. Hoffman.